Subaru Legacy 2004 Service Manual page 3207

VEHICLE DYNAMICS CONTROL (VDC) (DIAGNOSTICS)
Symptom
Poor change- Deviation to
direction-opera- right or left
tion stability of direction
TCS
Vehicle spin
Steering wheel drag while driving
VDC operates while driving nor-
mally.
General Diagnostic Table
Main probable cause
• VDCCM&H/U
• Defective ABS wheel speed sensor or
sensor gap
• Defective steering angle sensor or
improper neutral position
• Defective yaw rate & lateral G sensor
or improper installation
• Brake caliper
• Brake pad
• Wheel alignment
• Road surface (uneven)
• Road with crowns or banks
• Tire specifications, tire wear and air
pressures
• Incorrect wiring or piping connections
• VDCCM&H/U
• Defective ABS wheel speed sensor or
sensor gap
• Defective steering angle sensor or
improper neutral position
• Defective yaw rate & lateral G sensor
or improper installation
• Brake pad
• Tire specifications, tire wear and air
pressures
• Incorrect wiring or piping connections
• VDCCM&H/U
• Defective ABS wheel speed sensor or
sensor gap
• Defective steering angle sensor or
improper neutral position
• Defective yaw rate & lateral G sensor
or improper installation
• Incorrect wiring or piping connections
• Power steering system
• VDCCM&H/U
• Defective ABS wheel speed sensor or
sensor gap
• Defective steering angle sensor or
improper neutral position
• Defective yaw rate & lateral G sensor
or improper installation
• Wheel alignment
• Road surface (uneven)
• Road with crowns or banks
• Suspension play or fatigue (poor damp-
ing)
• Tire specifications, tire wear and air
pressures
• Incorrect wiring or piping connections
• Power steering system
VDC(diag)-134
Other probable cause
• Disc rotor
• Brake pipe
• Axle and wheels
• Suspension play or fatigue (poor damping)
• Brake caliper
• Brake pipe
• Brake caliper
• Brake pad
• Disc rotor
• Wheel alignment
• Road surface (uneven)
• Road with crowns or banks
• Suspension play or fatigue (poor damping)
• Tire specifications, tire wear and air pressures